hello, i am planning on building my first PC. it will have an intel core i5-3570k, but im not sure which case to use. i have decided in the corsair 500R ($109 on sale on newegg) or the corsair 550D. ($149 on newegg). the only thing i dont like about the 500r is the lack of dust filters and the side panels. however, it is much cheaper. so, which one should i get and why?